Air conditioner



FIG. 1 is a plan view of an air conditioner showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof, a left side view being symmetrical to the right side view;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for an air conditioner, as shown and described. 